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(#) Unused quantity translations

!!! WARNING: Unused quantity translations
   This is a warning.

Id
:   `UnusedQuantity`
Summary
:   Unused quantity translations
Severity
:   Warning
Category
:   Correctness: Messages
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/guide/topics/resources/string-resource.html#Plurals
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/PluralsDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/PluralsDetectorTest.java)
Copyright Year
:   2013

Android defines a number of different quantity strings, such as `zero`,
`one`, `few` and `many`. However, many languages do not distinguish
grammatically between all these different quantities.

This lint check looks at the quantity strings defined for each
translation and flags any quantity strings that are unused (because the
language does not make that quantity distinction, and Android will
therefore not look it up).

For example, in Chinese, only the `other` quantity is used, so even if
you provide translations for `zero` and `one`, these strings will
**not** be returned when `getQuantityString()` is called, even with `0`
or `1`.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/values-zh-rCN/plurals3.xml:3:Warning: For language "zh" (Chinese)
the following quantities are not relevant: one [UnusedQuantity]
  &lt;plurals name="draft"&gt;
  ^
res/values-zh-rCN/plurals3.xml:7:Warning: For language "zh" (Chinese)
the following quantities are not relevant: one [UnusedQuantity]
  &lt;plurals name="title_day_dialog_content"&gt;
  ^
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`res/values-zh-rCN/plurals3.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;resources xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  &lt;plurals name="draft"&gt;
    &lt;item quantity="one"&gt;"草稿"&lt;/item&gt;
    &lt;item quantity="other"&gt;"草稿"&lt;/item&gt;
  &lt;/plurals&gt;
  &lt;plurals name="title_day_dialog_content"&gt;
    &lt;item quantity="one"&gt;"天"&lt;/item&gt;
    &lt;item quantity="other"&gt;"天"&lt;/item&gt;
  &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values-cs/plurals3.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;resources&gt;
  &lt;plurals name="draft"&gt;
    &lt;item quantity="one"&gt;"Koncept"&lt;/item&gt;
    &lt;item quantity="other"&gt;"Koncepty"&lt;/item&gt;
  &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values-fr/plurals.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;resources&gt;
  &lt;plurals name="draft"&gt;
    &lt;item quantity="one"&gt;"brouillon"&lt;/item&gt;
    &lt;item quantity="other"&gt;"brouillons"&lt;/item&gt;
  &lt;/plurals&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/PluralsDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `PluralsDetector.test2`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute `tools:ignore="UnusedQuantity"` on
  the problematic XML element (or one of its enclosing elements). You
  may also need to add the following namespace declaration on the root
  element in the XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;resources xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;plurals tools:ignore="UnusedQuantity" .../&gt;
    ...
  &lt;/resources&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="UnusedQuantity" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'UnusedQuantity'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore UnusedQuantity ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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